Same size as on my Vectra 1.8. They gave me an awfully bumpy ride. I have today swopped them for 225/55R16s on Omega wheels, and the car is noticeably quieter and more comfortable.All my Astras are on 205/55R16s, they are comfortable enough. I see in the Astra brochure the 17" wheels are available as an option in the Sport pack, which is standard on the 2.0 16v Turbo/1.9CDTi 16v (150PS) models.My sporting days are over, now I seek comfort and quiet.

This was discussed before, and I never understood in what way the geometry was wrong. I was advised the Omega steel spare wheels would be all right. I reckonned other Omega wheels should be OK, as long as nothing fouled anywhere. Is it the offset? It drives all right, steering seems unchanged.

Terry get the actual offset that is stamped on the wheels and width of wheel 7J

I doubt Terry will be pushing the car hard enough for any geometry issues on a 11 year old car ,pottering about

Get the offset in particular wrong, and you'll feel the issues when creeping out of a parking space. Although lots of people get away with badly specified wheels, advising someone to just try them is stupid. Using unsuitable wheels/tyres just because you've got a stash of them is equally bad. Such stashes of tyres tend to be well past their best if not actually dangerous as well.

J is the bead profile and has nothing to do with the width, although they're usually quoted together.

The manual lists a broad range of tyre sizes, from 195/65 R 15 to 225/45 R 18, together with tyres pressures for many load options. The only mention of wheels is the tightening torque of 110Nm. Winter tyres size 235/35 R 19 are also possible.

The manual lists a broad range of tyre sizes, from 195/65 R 15 to 225/45 R 18, together with tyres pressures for many load options. The only mention of wheels is the tightening torque of 110Nm. Winter tyres size 235/35 R 19 are also possible.

It doesn't mention how to measure the bearing clearances either, because it's utterly unnecessary information for most users. Ever met someone who doesn't know if their car is FWD or RWD or what it means? They're most of the drivers out there.